JP6160184B2 - Display device - Google Patents

Description

  The present invention relates to a display device mounted on a vehicle.

  Conventionally, as this type of display device, for example, the one described in Patent Document 1 below is known. The display device described in Patent Document 1 includes a vehicle instrument mounted on a vehicle, in which internal device parts such as a liquid crystal display element and a backlight device are mounted, and the internal device parts are made of a metal frame. A liquid crystal display module (display means) housed in a body, a wiring board located behind the liquid crystal display module, a case body for housing the liquid crystal display module and the wiring board, and an opening shape in the wiring board Is provided with a small circular through hole with a small diameter, and a heat radiating member is provided on the back side of the case body, and the columnar extension forming portion that passes through the small diameter through hole in the heat radiating member and contacts the frame body (liquid crystal display module) Is formed. With this configuration, heat generated from the backlight device can be dissipated into the atmosphere through the frame body and the heat dissipating member with the extension forming portion.

JP 2005-189453 A

However, in the case of the display device described in Patent Document 1, the columnar extension forming portion provided in the heat dissipation member is configured to pass through a small-diameter through-hole provided in the wiring board and to contact the frame body. Therefore, there is a problem in that the contact area between the heat radiating member and the frame body is reduced, and sufficient heat radiating efficiency cannot be obtained, leaving room for further improvement.
Therefore, the present invention aims to provide a display device capable of improving the heat dissipation efficiency in order to cope with the above-described problems.

  The present invention provides a display device having a display element having a display unit for displaying predetermined information, a light source that supplies illumination light to the display element, and a frame body made of a conductive material that houses the display element and the light source. And a wiring board located behind the display means, a case body for housing the display means and the wiring board, and a heat radiating member located behind the case body, wherein the frame generates heat generated from the light source. The frame body and the heat dissipating member are thermally connected by a heat transfer member so as to transmit from the body to the heat dissipating member, and the heat transfer member includes a first heat transfer unit that contacts the frame body, The board of the wiring board of the first heat transfer portion is integrally formed with a second heat transfer portion that comes into contact with the heat radiating member in a state of passing through a through portion provided in the case body. Size along the surface direction But it characterized in that it is larger than the size along the plate surface direction of the wiring board of the second heat transfer portion.

In addition, the present invention provides a display unit having a display element having a display unit for displaying predetermined information, a light source that supplies illumination light to the display element, and a frame body made of a conductive material that houses the display element and the light source. And a wiring board located behind the display means, a case body for housing the display means and the wiring board, and a heat radiating member having a first heat radiating portion located behind the case body, The frame body and the heat dissipation member are thermally connected by a heat transfer member so as to transmit heat generated from a light source from the frame body to the heat dissipation member, and the heat dissipation member includes the first heat dissipation portion, A second heat radiating portion that comes into contact with the heat transfer member in a state of passing through a through portion provided in the case body is integrally formed, and the heat transfer member is disposed on the back surface of the frame. Set times Avoid substrate contacts the frame and the surface, the wire size along the plate surface direction of the substrate of the heat transfer member, than the size along the plate surface direction of the wiring board of the second heat radiating portion It is characterized by being larger.

  According to the present invention, in the heat transfer member, a part of the first heat transfer portion and the second heat transfer portion are located outside the display means, and the second heat transfer portion is the heat dissipation member. It is in contact with the member.

  Further, the present invention is characterized in that the required part of the heat transfer member is located outside the display means, and the required part is in contact with the second heat radiating part.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus which can achieve an initial objective and can improve heat dissipation efficiency can be provided.

1 is a front view of a display device according to a first embodiment of the present invention. AA sectional drawing of FIG. The rear view of the display apparatus of the state which removed the heat radiating member and case body by 1st Embodiment. Sectional drawing of the principal part of the display apparatus by the modification of the 1st Embodiment. The side view of the display apparatus of the state which removed the heat radiating member and case body by the other modification of the 1st Embodiment. Sectional drawing of the principal part of the display apparatus by 2nd Embodiment of this invention. Sectional drawing of the principal part of the display apparatus by the modification of the 2nd Embodiment.

(First Embodiment) A case where the display device of the present invention is applied to a vehicle instrument mounted on a vehicle will be described as an example with reference to FIGS.

  1 and 2, a vehicle instrument D as a display device according to the present embodiment includes a display means 10, a translucent protective member 20 that covers the surface side of the display means 10 on the viewer side, and a display means. 10, a wiring board 30 located behind 10, a case body 40 that accommodates the display means 10, the protective member 20, the wiring board 30, etc., a heat radiation member 50 located behind the case body 40, and the display means 10 and heat radiation. And a heat transfer member 60 disposed between the members 50.

  The display means 10 includes a display element 11, a source line driving circuit (not shown) for driving the source line (signal line) of the display element 11, and a gate line for driving the gate line (scanning line) of the display element 11. A driving circuit (not shown), a light guide body 12a, a light source 12b, a first flexible wiring board 12c, and the like, are composed of an illuminating means 12 for guiding illumination light to the display element 11, the display element 11 and the light guide. A frame body 16 made of a conductive material which comprises a resin case 13 made of a substantially flat white resin for holding the body 12a, a front frame 14 and a back frame 15 and which constitutes an exterior case of the display means 10, and a wiring board Various timing signals for controlling the timing of the source line driving circuit and the gate line driving circuit are generated on the basis of a command signal from a control means (not shown) mounted on 30. Lee timing controller (not shown) or the like and a circuit board 17 mounted.

  In this case, the frame body 16 composed of the front frame 14 and the rear frame 15 paired with the front frame 14 includes the display element 11, the light guide body 12a, the light source 12b, the resin case 13 and the like. The circuit board 17 is housed (accommodated), and is electrically connected to the wiring board 30 and arranged so as to contact a part of the rear surface of the second main body portion described later of the rear frame 15.

  If necessary, one or more optical members (for example, a diffusion sheet or a prism sheet) for illuminating the display element 11 with substantially uniform backlight may be disposed between the display element 11 and the light guide 12a. Good.

  The display element 11 includes, for example, a TFT-type liquid crystal display element having a plurality of pixels, and vehicle information such as vehicle speed, engine speed, travel distance, fuel consumption, and the like based on detection signals from various sensors mounted on the vehicle. A display unit 11a for displaying (predetermined information) is provided. The display unit 11 a is displayed in a display area (not shown) of the display element 11.

  The light guide 12 a is made of a substantially flat transparent translucent resin and is disposed along the back surface of the display element 11. In other words, the light guide 12a is arranged in the illumination optical path from the light source 12b to the display element 11.

  The light sources 12b are formed of chip-type light emitting diodes that emit colors as appropriate. In FIG. 2, a plurality of light sources 12b are arranged in a line along one side surface 12d located on the upper side of the light guide 12a, and illuminate light to the display element 11. It consists of the luminous body to supply.

  The front frame 14 is made of a conductive material and is press-molded in a substantially frame shape. The front frame 14a is a main portion of the front frame 14 and the first peripheral wall 14b is formed to hang downward from the periphery of the front surface 14a. And are integrally formed. A display window portion 14c including a substantially rectangular opening window is formed at a substantially central portion of the front surface portion 14a so as to correspond to the display portion 11a.

  The back frame 15 is made of a conductive material like the front frame 14, and is formed in a substantially concave shape in cross section. The bottom surface 15a forms the main part of the back frame 15 and the first peripheral wall 14b side from the periphery of the bottom surface 15a. And a second peripheral wall portion 15b that protrudes toward the surface.

  In FIG. 2, the first flexible wiring board 12c is appropriately fixed to the inner wall surface 15c of the second peripheral wall portion 15b positioned above using an appropriate fixing means, and each light source 12b is connected to the light guide 12a. It is mounted on a conductive path (not shown) provided in the first flexible wiring board 12c so as to face the one side surface 12d.

  The protective member 20 includes a flat light-transmitting substrate 21 made of a light-transmitting resin material as a base material, and a non-transmitting portion 22 formed of a black light-shielding layer printed on the back surface of the light-transmitting substrate 21. The non-transparent portion 22 is formed on the rear surface of the translucent substrate 21 so as to exclude the display area of the display portion 11a (that is, the front portion 14a of the front frame 14 is invisible from the viewer side). Print formed. The viewer can visually recognize the vehicle information through 21 portions of the translucent substrate in which the non-opaque portion 22 is not formed.

  For example, the wiring board 30 is formed of a hard circuit board in which a wiring pattern (not shown) is provided on a glass epoxy base material. For example, the command signal for causing the display element 11 to perform a display operation and the light source 12b for lighting operation. The control means for outputting other command signals and circuit components (not shown) such as resistors and capacitors are conductively connected to the wiring pattern. In addition, 31 is a hole part which consists of a small diameter through-hole provided in the wiring board 30 so that the 2nd heat-transfer part mentioned later provided in the heat-transfer member 60 may be penetrated.

  The case body 40 is made of a synthetic resin, is formed in a substantially box shape, and constitutes an exterior case of the vehicle instrument D. Inside thereof, the display means 10, the protection member 20, the wiring board 30, the heat transfer The member 60 etc. are accommodated.

  In addition, an opening window 41 is formed on the front side of the case body 40 so as to correspond to the display portion 11 a of the display element 11, and a position corresponding to the hole portion 31 of the wiring board 30 is provided on the bottom portion 42 of the case body 40. In addition, a through-hole 43 made of a small-diameter through-hole for penetrating the second heat transfer section is provided.

  The heat radiating member 50 is made of a metal material having high thermal conductivity such as aluminum, is formed in a substantially flat plate shape, and the back of the case body 40 so that a part thereof is in contact with the second heat transfer portion of the heat transfer member 60. Is located.

The heat transfer member 60 is made of a metal material having high thermal conductivity such as aluminum and is formed in a substantially L shape. The heat transfer member 60 transmits heat generated from the light source 12b to the heat dissipation member 50 from the frame body 16 when the light source 12b is turned on. Thus, the frame body 16 and the heat radiating member 50 are thermally connected.

  Further, as shown in FIG. 3, the heat transfer member 60 is arranged so as to avoid the circuit board 17 disposed so as to contact a part of the back surface of the bottom surface portion 15a of the back frame 15 (that is, the frame body 16). The first U-shaped first heat transfer portion 61 that is in contact with the back surface portion of the bottom surface portion 15a excluding the portion, the through portion 43 provided in the case body 40, and the other provided on the wiring board 30 The second heat transfer portion 62 that is in contact with the part of the heat radiating member 50 in a state of passing through both the hole portion 31 as the through portion is integrally formed.

  Note that the heat conductive sheet 70 may be interposed between the first heat transfer unit 61 and the bottom surface 15a of the back frame 15 or between the second heat transfer unit 62 and the heat dissipation member 50. Good.

  Here, focusing on the shapes of the first heat transfer section 61 and the second heat transfer section 62, as shown in FIG. 2, the first heat transfer section in contact with the back frame 15 (frame body 16). 61 is formed in a wide block shape having a relatively wide width along the plate surface direction X of the wiring board 30, while the first through the hole portion 31 and the through portion 43, each having a small diameter through hole. The second heat transfer section 62 is formed in a vertically long and narrow block shape whose width along the plate surface direction X is narrower than that of the first heat transfer section 61. That is, in the case of this example, the size along the plate surface direction X of the wiring board 30 of the first heat transfer unit 61 is the size along the plate surface direction X of the wiring substrate 30 of the second heat transfer unit 62. It is bigger than that.

  Accordingly, the entire back surface of the bottom surface portion 15a (back frame 15) excluding the position where the circuit board 17 is disposed and the first heat transfer portion 61 formed wide as described above are in surface contact (contact) over a wide range. As a result, the heat generated from the light source 12b when the light source 12b is turned on is changed from the rear frame 15 → the first heat transfer portion 61 (formed wide) → the second (formed narrow) The heat transfer section 62 is efficiently guided to the heat radiating member 50 (located outside the case body 40).

  A vehicle meter D is configured by the above-described units. In such a configuration, when the command signal for causing the display element 11 to perform a display operation and the other command signal for causing the light source 12b to perform a lighting operation are output from the control means, the display unit 11a of the display element 11 is displayed. The vehicle information is displayed at the same time, and the vehicle information is backlit as the light source 12b is turned on.

At this time, when the light source 12b is turned on, heat generated from the light source 12b is generated from the rear frame 15, the first heat transfer section 61 (formed in a wide width), and the second heat transfer section (formed in a narrow width). 62, since it is dissipated (heat dissipated) into the atmosphere through the heat dissipating member 50 (located outside the case body 40), it is possible to provide the vehicle instrument D capable of improving the heat dissipating efficiency.

  As described above, in the present embodiment, the display element 11 including the display unit 11a that displays the vehicle information, the light source 12b that supplies illumination light to the display element 11, and the conductive material that houses the display element 11 and the light source 12b. A display unit 10 having a frame body 16 composed of: a wiring board 30 located behind the display means 10; a case body 40 accommodating the display means 10 and the wiring board 30; and a position located behind the case body 40. A heat radiating member 50 that thermally connects the frame body 16 and the heat radiating member 50 with the heat transfer member 60 so as to transmit heat generated from the light source 12b from the frame body 16 to the heat radiating member 50. Reference numeral 60 denotes a first heat transfer portion 61 that comes into contact with the frame body 16 and a second heat transfer portion 62 that comes into contact with the heat radiating member 50 in a state of passing through the through portion 43 provided in the case body 40. Are integrally formed, and the size along the plate surface direction X of the wiring board 30 of the first heat transfer unit 61 is the plate surface direction X of the wiring substrate 30 of the second heat transfer unit 62. It is larger than the size along.

Therefore, the heat generated from the light source 12b is the rear frame 15, the first heat transfer portion 61, the second heat transfer portion 62 (located outside the case body 40 constituting the exterior case of the vehicle instrument D). Since it dissipates (dissipates heat) into the atmosphere via the heat dissipating member 50, the vehicle meter D capable of improving the heat dissipating efficiency can be provided.

  Moreover, although this embodiment demonstrated the example in which the 2nd heat-transfer part 62 of the heat-transfer member 60 has penetrated both the hole 31 of the wiring board 30, and the penetration part 43 of the case body 40, for example, Although not shown in detail, the wiring board 30 is provided with a cutout portion that avoids the second transmission portion 62, or as a modification of the present embodiment, the second transmission portion 62 is provided as a case body as shown in FIG. It is good also as a structure which arrange | positions along the one side wall part 44 of 40, and the 2nd heat-transfer part 62 penetrates only the penetration part 43. In the modification of the present embodiment shown in FIG. 4, the heat transfer member 60 includes a part of the first heat transfer part 61 (that is, an extended part indicated by symbol Y in FIG. 4) and the second heat transfer part. 62 is positioned so as to protrude outside the display means 10, and the second heat transfer section 62 is in contact with the heat radiating member 40.

  In the present embodiment, the first heat transfer portion 61 of the heat transfer member 60 that is in contact with the back surface of the bottom surface portion 15 a is formed in a substantially U shape so as to avoid the position where the circuit board 17 is disposed. However, any shape can be adopted as the shape of the first heat transfer section 61 as long as the size along the plate surface direction X is larger than that of the second heat transfer section 62. For example, the shape of the first heat transfer section 61 may be formed in an L shape or a frame shape, and as another modified example of the present embodiment, the plate surface direction X (or the plate surface) as shown in FIG. You may provide the hollow part 63 which consists of a recessed part etc. which avoid the circuit board 17 in the center part of the 1st heat-transfer part 61 along the direction orthogonal to the direction X).

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. 6. The same reference numerals are used for the same or corresponding parts as in the first embodiment, and the detailed description thereof will be made. Omitted. In the second embodiment, the second heat transfer section 62 of the heat transfer member 60 is eliminated, and the heat transfer member 60 is configured only by the first heat transfer section 61 employed in the first embodiment. A portion corresponding to the second heat transfer section 62 is integrally formed on the heat radiating member 50 side.

  That is, the heat radiating member 50 in the second embodiment is formed in a substantially L shape as shown in FIG. 6, and the first heat radiating portion 51 located behind the case body 40 and the through portion 43 of the case body 40. A second heat radiating portion 52 that is in contact with the heat transfer member 60 (first heat transfer portion 61) in a state of passing through the hole portion 31 of the wiring board 30 is integrally formed. In addition, it is good also as a structure which interposes the heat conductive sheet 70 between the heat-transfer member 60 and the bottom face part 15a, or between the heat-transfer member 60 and the 2nd thermal radiation part 52. FIG.

  Here, paying attention to the shape of the heat transfer member 60 and the second heat radiation part 52, the heat transfer member 60 is formed in a wide block shape having a relatively wide width along the plate surface direction X of the wiring board 30. On the other hand, the second heat radiating part 52 penetrating the hole part 31 and the through part 43 having a small-diameter through hole has a vertically long and narrow width that is narrower than the heat transfer member 60 in the plate surface direction X. The block shape is formed. That is, in the case of the second embodiment, the size of the heat transfer member 60 along the plate surface direction X of the wiring substrate 30 is larger than the size of the second heat dissipation portion 52 along the plate surface direction X of the wiring substrate 30. It is getting bigger.

  According to the second embodiment, the heat dissipating member 50 includes the first heat dissipating part 51 located behind the case body 40, the through part 43 provided in the case body 40, and other through parts provided in the wiring board 30. The second heat dissipating part 52 that comes into contact with the heat transfer member 60 in a state of passing through both the hole 31 as a part is integrally formed, and the plate surface of the wiring substrate 30 of the heat transfer member 60 The size along the direction X is larger than the size along the plate surface direction X of the wiring board 30 of the second heat radiation part 52.

  Accordingly, the entire back surface of the bottom surface portion 15a (the back frame 15) excluding the position where the circuit board 17 is disposed and the wide heat transfer member 60 are in surface contact (contact) over a wide range, so that the light source The heat generated from the light source 12b when the light 12b is turned on is generated by the back frame 15, the heat transfer member 60, the second heat radiating portion 52 (formed narrowly), and the first (disposed outside the case body 40). Since it is dissipated (dissipated) into the atmosphere through the heat dissipating part 51, the vehicle meter D capable of improving the heat dissipating efficiency as in the first embodiment can be provided.

  In the second embodiment, the example in which the second heat radiating portion 52 of the heat radiating member 50 penetrates both the hole portion 31 of the wiring board 30 and the through portion 43 of the case body 40 has been described. Although not shown in detail, the circuit board 30 is provided with a cutout portion that avoids the second heat radiating portion 52, or as a modification of the second embodiment, the second heat radiating portion 52 is provided as shown in FIG. It is good also as a structure which arrange | positions so that the one side wall part 44 of the case body 40 may be followed (it abuts), and the 2nd thermal radiation part 52 penetrates only the penetration part 43. FIG.

  In the modification of the second embodiment shown in FIG. 7, the heat transfer member 60 is positioned such that a required portion (that is, an extended portion indicated by a symbol Y in FIG. 7) protrudes outside the display means 10. Thus, the required part is in contact with the second heat radiating part 52.

  Further, in the case where the second heat radiating portion 52 is arranged along (is in contact with) one side wall portion 44 as in the modification of the second embodiment shown in FIG. It is also possible to integrally form 40 and the heat dissipation member 50 by insert molding. In addition, when the case body 40 and the heat radiating member 50 are integrally formed by insert molding, through-hole shaped openings (not shown) are formed in the 44 side wall portions corresponding to the second heat radiating portion 52 as necessary. One or more may be provided. In this case, since the second heat radiation part 52 is partially exposed from the opening, the heat radiation efficiency can be further improved. Moreover, since the second heat dissipating part 52 is in close contact (contact) with the side wall part 44 so as to close the opening, in a vehicle such as a motorcycle, for example, the heat dissipating member 50 and the opening are formed. It can be said that the insert molding with the case body 40 is an advantageous configuration in order to improve waterproofness.

DESCRIPTION OF SYMBOLS 10 Display means 11 Display element 11a Display part 12 Illumination means 12b Light source 13 Resin case 14 Front frame 14c Display window part 15 Back frame 16 Frame body 17 Circuit board 20 Protection member 30 Wiring board 31 Hole part (other penetration part)
40 Case body 43 Penetration part 50 Heat radiating member 51 1st heat radiating part 52 2nd heat radiating part 60 Heat transfer member 61 1st heat transfer part 62 2nd heat transfer part 63 Recessed part X Plate | board surface direction

Claims (4)

Display means comprising a display element having a display unit for displaying predetermined information, a light source for supplying illumination light to the display element, and a frame body made of a conductive material that houses the display element and the light source;
A wiring board located behind the display means;
A case body for housing the display means and the wiring board;
A heat dissipating member located behind the case body,
The frame body and the heat radiating member are thermally connected by a heat transfer member so as to transmit heat generated from the light source from the frame body to the heat radiating member,
The heat transfer member is integrally formed with a first heat transfer portion that comes into contact with the frame body and a second heat transfer portion that comes into contact with the heat dissipation member in a state of passing through a through portion provided in the case body. It has been configured,
The size of the first heat transfer portion along the plate surface direction of the wiring substrate is larger than the size of the second heat transfer portion along the plate surface direction of the wiring substrate. Display device. Display means comprising a display element having a display unit for displaying predetermined information, a light source for supplying illumination light to the display element, and a frame body made of a conductive material that houses the display element and the light source;
A wiring board located behind the display means;
A case body for housing the display means and the wiring board;
A heat dissipating member having a first heat dissipating part located behind the case body,
The frame body and the heat radiating member are thermally connected by a heat transfer member so as to transmit heat generated from the light source from the frame body to the heat radiating member,
The heat dissipating member has a configuration in which the first heat dissipating part and a second heat dissipating part that comes into contact with the heat transfer member in a state of passing through a through part provided in the case body are integrally formed. ,
The heat transfer member, said to touch frame and interviews to avoid the circuit board arranged on a rear surface of the frame, the wire size along the plate surface direction of the substrate of the heat transfer member, said second A display device characterized in that the size of the heat dissipating part is larger than the size along the plate surface direction of the wiring board.
In the heat transfer member, a part of the first heat transfer portion and the second heat transfer portion are located outside the display means, and the second heat transfer portion is in contact with the heat dissipation member. The display device according to claim 1, wherein: The display device according to claim 2, wherein a required portion of the heat transfer member is located outside the display means, and the required portion is in contact with the second heat radiating portion.

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